1# SPDX-License-Identifier: GPL-2.0 2VERSION = 5 3PATCHLEVEL = 11 4SUBLEVEL = 0 5EXTRAVERSION = 6NAME = �� Valentine's Day Edition �� 7 8# *DOCUMENTATION* 9# To see a list of typical targets execute "make help" 10# More info can be located in ./README 11# Comments in this file are targeted only to the developer, do not 12# expect to learn how to build the kernel reading this file. 13 14$(if $(filter __%, $(MAKECMDGOALS)), \ 15 $(error targets prefixed with '__' are only for internal use)) 16 17# That's our default target when none is given on the command line 18PHONY := __all 19__all: 20 21# We are using a recursive build, so we need to do a little thinking 22# to get the ordering right. 23# 24# Most importantly: sub-Makefiles should only ever modify files in 25# their own directory. If in some directory we have a dependency on 26# a file in another dir (which doesn't happen often, but it's often 27# unavoidable when linking the built-in.a targets which finally 28# turn into vmlinux), we will call a sub make in that other dir, and 29# after that we are sure that everything which is in that other dir 30# is now up to date. 31# 32# The only cases where we need to modify files which have global 33# effects are thus separated out and done before the recursive 34# descending is started. They are now explicitly listed as the 35# prepare rule. 36 37ifneq ($(sub_make_done),1) 38 39# Do not use make's built-in rules and variables 40# (this increases performance and avoids hard-to-debug behaviour) 41MAKEFLAGS += -rR 42 43# Avoid funny character set dependencies 44unexport LC_ALL 45LC_COLLATE=C 46LC_NUMERIC=C 47export LC_COLLATE LC_NUMERIC 48 49# Avoid interference with shell env settings 50unexport GREP_OPTIONS 51 52# Beautify output 53# --------------------------------------------------------------------------- 54# 55# Normally, we echo the whole command before executing it. By making 56# that echo $($(quiet)$(cmd)), we now have the possibility to set 57# $(quiet) to choose other forms of output instead, e.g. 58# 59# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 60# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 61# 62# If $(quiet) is empty, the whole command will be printed. 63# If it is set to "quiet_", only the short version will be printed. 64# If it is set to "silent_", nothing will be printed at all, since 65# the variable $(silent_cmd_cc_o_c) doesn't exist. 66# 67# A simple variant is to prefix commands with $(Q) - that's useful 68# for commands that shall be hidden in non-verbose mode. 69# 70# $(Q)ln $@ :< 71# 72# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 73# If KBUILD_VERBOSE equals 1 then the above command is displayed. 74# If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt. 75# 76# To put more focus on warnings, be less verbose as default 77# Use 'make V=1' to see the full commands 78 79ifeq ("$(origin V)", "command line") 80 KBUILD_VERBOSE = $(V) 81endif 82ifndef KBUILD_VERBOSE 83 KBUILD_VERBOSE = 0 84endif 85 86ifeq ($(KBUILD_VERBOSE),1) 87 quiet = 88 Q = 89else 90 quiet=quiet_ 91 Q = @ 92endif 93 94# If the user is running make -s (silent mode), suppress echoing of 95# commands 96 97ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) 98 quiet=silent_ 99endif 100 101export quiet Q KBUILD_VERBOSE 102 103# Kbuild will save output files in the current working directory. 104# This does not need to match to the root of the kernel source tree. 105# 106# For example, you can do this: 107# 108# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 109# 110# If you want to save output files in a different location, there are 111# two syntaxes to specify it. 112# 113# 1) O= 114# Use "make O=dir/to/store/output/files/" 115# 116# 2) Set KBUILD_OUTPUT 117# Set the environment variable KBUILD_OUTPUT to point to the output directory. 118# export KBUILD_OUTPUT=dir/to/store/output/files/; make 119# 120# The O= assignment takes precedence over the KBUILD_OUTPUT environment 121# variable. 122 123# Do we want to change the working directory? 124ifeq ("$(origin O)", "command line") 125 KBUILD_OUTPUT := $(O) 126endif 127 128ifneq ($(KBUILD_OUTPUT),) 129# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot 130# expand a shell special character '~'. We use a somewhat tedious way here. 131abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd) 132$(if $(abs_objtree),, \ 133 $(error failed to create output directory "$(KBUILD_OUTPUT)")) 134 135# $(realpath ...) resolves symlinks 136abs_objtree := $(realpath $(abs_objtree)) 137else 138abs_objtree := $(CURDIR) 139endif # ifneq ($(KBUILD_OUTPUT),) 140 141ifeq ($(abs_objtree),$(CURDIR)) 142# Suppress "Entering directory ..." unless we are changing the work directory. 143MAKEFLAGS += --no-print-directory 144else 145need-sub-make := 1 146endif 147 148abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST)))) 149 150ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 151$(error source directory cannot contain spaces or colons) 152endif 153 154ifneq ($(abs_srctree),$(abs_objtree)) 155# Look for make include files relative to root of kernel src 156# 157# This does not become effective immediately because MAKEFLAGS is re-parsed 158# once after the Makefile is read. We need to invoke sub-make. 159MAKEFLAGS += --include-dir=$(abs_srctree) 160need-sub-make := 1 161endif 162 163this-makefile := $(lastword $(MAKEFILE_LIST)) 164 165ifneq ($(filter 3.%,$(MAKE_VERSION)),) 166# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 167# We need to invoke sub-make to avoid implicit rules in the top Makefile. 168need-sub-make := 1 169# Cancel implicit rules for this Makefile. 170$(this-makefile): ; 171endif 172 173export abs_srctree abs_objtree 174export sub_make_done := 1 175 176ifeq ($(need-sub-make),1) 177 178PHONY += $(MAKECMDGOALS) __sub-make 179 180$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 181 @: 182 183# Invoke a second make in the output directory, passing relevant variables 184__sub-make: 185 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 186 187endif # need-sub-make 188endif # sub_make_done 189 190# We process the rest of the Makefile if this is the final invocation of make 191ifeq ($(need-sub-make),) 192 193# Do not print "Entering directory ...", 194# but we want to display it when entering to the output directory 195# so that IDEs/editors are able to understand relative filenames. 196MAKEFLAGS += --no-print-directory 197 198# Call a source code checker (by default, "sparse") as part of the 199# C compilation. 200# 201# Use 'make C=1' to enable checking of only re-compiled files. 202# Use 'make C=2' to enable checking of *all* source files, regardless 203# of whether they are re-compiled or not. 204# 205# See the file "Documentation/dev-tools/sparse.rst" for more details, 206# including where to get the "sparse" utility. 207 208ifeq ("$(origin C)", "command line") 209 KBUILD_CHECKSRC = $(C) 210endif 211ifndef KBUILD_CHECKSRC 212 KBUILD_CHECKSRC = 0 213endif 214 215# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the 216# directory of external module to build. Setting M= takes precedence. 217ifeq ("$(origin M)", "command line") 218 KBUILD_EXTMOD := $(M) 219endif 220 221$(if $(word 2, $(KBUILD_EXTMOD)), \ 222 $(error building multiple external modules is not supported)) 223 224export KBUILD_CHECKSRC KBUILD_EXTMOD 225 226extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 227 228ifeq ($(abs_srctree),$(abs_objtree)) 229 # building in the source tree 230 srctree := . 231 building_out_of_srctree := 232else 233 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 234 # building in a subdirectory of the source tree 235 srctree := .. 236 else 237 srctree := $(abs_srctree) 238 endif 239 building_out_of_srctree := 1 240endif 241 242ifneq ($(KBUILD_ABS_SRCTREE),) 243srctree := $(abs_srctree) 244endif 245 246objtree := . 247VPATH := $(srctree) 248 249export building_out_of_srctree srctree objtree VPATH 250 251# To make sure we do not include .config for any of the *config targets 252# catch them early, and hand them over to scripts/kconfig/Makefile 253# It is allowed to specify more targets when calling make, including 254# mixing *config targets and build targets. 255# For example 'make oldconfig all'. 256# Detect when mixed targets is specified, and make a second invocation 257# of make so .config is not included in this case either (for *config). 258 259version_h := include/generated/uapi/linux/version.h 260old_version_h := include/linux/version.h 261 262clean-targets := %clean mrproper cleandocs 263no-dot-config-targets := $(clean-targets) \ 264 cscope gtags TAGS tags help% %docs check% coccicheck \ 265 $(version_h) headers headers_% archheaders archscripts \ 266 %asm-generic kernelversion %src-pkg dt_binding_check \ 267 outputmakefile 268no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease 269single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/ 270 271config-build := 272mixed-build := 273need-config := 1 274may-sync-config := 1 275single-build := 276 277ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 278 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 279 need-config := 280 endif 281endif 282 283ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 284 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 285 may-sync-config := 286 endif 287endif 288 289ifneq ($(KBUILD_EXTMOD),) 290 may-sync-config := 291endif 292 293ifeq ($(KBUILD_EXTMOD),) 294 ifneq ($(filter %config,$(MAKECMDGOALS)),) 295 config-build := 1 296 ifneq ($(words $(MAKECMDGOALS)),1) 297 mixed-build := 1 298 endif 299 endif 300endif 301 302# We cannot build single targets and the others at the same time 303ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 304 single-build := 1 305 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 306 mixed-build := 1 307 endif 308endif 309 310# For "make -j clean all", "make -j mrproper defconfig all", etc. 311ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 312 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 313 mixed-build := 1 314 endif 315endif 316 317# install and modules_install need also be processed one by one 318ifneq ($(filter install,$(MAKECMDGOALS)),) 319 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 320 mixed-build := 1 321 endif 322endif 323 324ifdef mixed-build 325# =========================================================================== 326# We're called with mixed targets (*config and build targets). 327# Handle them one by one. 328 329PHONY += $(MAKECMDGOALS) __build_one_by_one 330 331$(MAKECMDGOALS): __build_one_by_one 332 @: 333 334__build_one_by_one: 335 $(Q)set -e; \ 336 for i in $(MAKECMDGOALS); do \ 337 $(MAKE) -f $(srctree)/Makefile $$i; \ 338 done 339 340else # !mixed-build 341 342include scripts/Kbuild.include 343 344# Read KERNELRELEASE from include/config/kernel.release (if it exists) 345KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 346KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 347export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 348 349include scripts/subarch.include 350 351# Cross compiling and selecting different set of gcc/bin-utils 352# --------------------------------------------------------------------------- 353# 354# When performing cross compilation for other architectures ARCH shall be set 355# to the target architecture. (See arch/* for the possibilities). 356# ARCH can be set during invocation of make: 357# make ARCH=ia64 358# Another way is to have ARCH set in the environment. 359# The default ARCH is the host where make is executed. 360 361# CROSS_COMPILE specify the prefix used for all executables used 362# during compilation. Only gcc and related bin-utils executables 363# are prefixed with $(CROSS_COMPILE). 364# CROSS_COMPILE can be set on the command line 365# make CROSS_COMPILE=ia64-linux- 366# Alternatively CROSS_COMPILE can be set in the environment. 367# Default value for CROSS_COMPILE is not to prefix executables 368# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 369ARCH ?= $(SUBARCH) 370 371# Architecture as present in compile.h 372UTS_MACHINE := $(ARCH) 373SRCARCH := $(ARCH) 374 375# Additional ARCH settings for x86 376ifeq ($(ARCH),i386) 377 SRCARCH := x86 378endif 379ifeq ($(ARCH),x86_64) 380 SRCARCH := x86 381endif 382 383# Additional ARCH settings for sparc 384ifeq ($(ARCH),sparc32) 385 SRCARCH := sparc 386endif 387ifeq ($(ARCH),sparc64) 388 SRCARCH := sparc 389endif 390 391# Additional ARCH settings for sh 392ifeq ($(ARCH),sh64) 393 SRCARCH := sh 394endif 395 396KCONFIG_CONFIG ?= .config 397export KCONFIG_CONFIG 398 399# Default file for 'make defconfig'. This may be overridden by arch-Makefile. 400export KBUILD_DEFCONFIG := defconfig 401 402# SHELL used by kbuild 403CONFIG_SHELL := sh 404 405HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 406HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 407HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 408 409ifneq ($(LLVM),) 410HOSTCC = clang 411HOSTCXX = clang++ 412else 413HOSTCC = gcc 414HOSTCXX = g++ 415endif 416 417export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 418 -O2 -fomit-frame-pointer -std=gnu89 419export KBUILD_USERLDFLAGS := 420 421KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 422KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 423KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 424KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 425 426# Make variables (CC, etc...) 427CPP = $(CC) -E 428ifneq ($(LLVM),) 429CC = clang 430LD = ld.lld 431AR = llvm-ar 432NM = llvm-nm 433OBJCOPY = llvm-objcopy 434OBJDUMP = llvm-objdump 435READELF = llvm-readelf 436STRIP = llvm-strip 437else 438CC = $(CROSS_COMPILE)gcc 439LD = $(CROSS_COMPILE)ld 440AR = $(CROSS_COMPILE)ar 441NM = $(CROSS_COMPILE)nm 442OBJCOPY = $(CROSS_COMPILE)objcopy 443OBJDUMP = $(CROSS_COMPILE)objdump 444READELF = $(CROSS_COMPILE)readelf 445STRIP = $(CROSS_COMPILE)strip 446endif 447PAHOLE = pahole 448RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 449LEX = flex 450YACC = bison 451AWK = awk 452INSTALLKERNEL := installkernel 453DEPMOD = depmod 454PERL = perl 455PYTHON3 = python3 456CHECK = sparse 457BASH = bash 458KGZIP = gzip 459KBZIP2 = bzip2 460KLZOP = lzop 461LZMA = lzma 462LZ4 = lz4c 463XZ = xz 464ZSTD = zstd 465 466CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 467 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 468NOSTDINC_FLAGS := 469CFLAGS_MODULE = 470AFLAGS_MODULE = 471LDFLAGS_MODULE = 472CFLAGS_KERNEL = 473AFLAGS_KERNEL = 474LDFLAGS_vmlinux = 475 476# Use USERINCLUDE when you must reference the UAPI directories only. 477USERINCLUDE := \ 478 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 479 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 480 -I$(srctree)/include/uapi \ 481 -I$(objtree)/include/generated/uapi \ 482 -include $(srctree)/include/linux/kconfig.h 483 484# Use LINUXINCLUDE when you must reference the include/ directory. 485# Needed to be compatible with the O= option 486LINUXINCLUDE := \ 487 -I$(srctree)/arch/$(SRCARCH)/include \ 488 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 489 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 490 -I$(objtree)/include \ 491 $(USERINCLUDE) 492 493KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 494KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 495 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 496 -Werror=implicit-function-declaration -Werror=implicit-int \ 497 -Werror=return-type -Wno-format-security \ 498 -std=gnu89 499KBUILD_CPPFLAGS := -D__KERNEL__ 500KBUILD_AFLAGS_KERNEL := 501KBUILD_CFLAGS_KERNEL := 502KBUILD_AFLAGS_MODULE := -DMODULE 503KBUILD_CFLAGS_MODULE := -DMODULE 504KBUILD_LDFLAGS_MODULE := 505KBUILD_LDFLAGS := 506CLANG_FLAGS := 507 508export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC 509export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 510export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 511export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 512export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 513 514export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 515export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 516export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 517export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 518export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 519 520# Files to ignore in find ... statements 521 522export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 523 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 524 -prune -o 525export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 526 --exclude CVS --exclude .pc --exclude .hg --exclude .git 527 528# =========================================================================== 529# Rules shared between *config targets and build targets 530 531# Basic helpers built in scripts/basic/ 532PHONY += scripts_basic 533scripts_basic: 534 $(Q)$(MAKE) $(build)=scripts/basic 535 $(Q)rm -f .tmp_quiet_recordmcount 536 537PHONY += outputmakefile 538# Before starting out-of-tree build, make sure the source tree is clean. 539# outputmakefile generates a Makefile in the output directory, if using a 540# separate output directory. This allows convenient use of make in the 541# output directory. 542# At the same time when output Makefile generated, generate .gitignore to 543# ignore whole output directory 544outputmakefile: 545ifdef building_out_of_srctree 546 $(Q)if [ -f $(srctree)/.config -o \ 547 -d $(srctree)/include/config -o \ 548 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 549 echo >&2 "***"; \ 550 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 551 echo >&2 "*** in $(abs_srctree)";\ 552 echo >&2 "***"; \ 553 false; \ 554 fi 555 $(Q)ln -fsn $(srctree) source 556 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree) 557 $(Q)test -e .gitignore || \ 558 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 559endif 560 561ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),) 562ifneq ($(CROSS_COMPILE),) 563CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%)) 564GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit)) 565CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE)) 566GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..) 567endif 568ifneq ($(GCC_TOOLCHAIN),) 569CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN) 570endif 571ifneq ($(LLVM_IAS),1) 572CLANG_FLAGS += -no-integrated-as 573endif 574CLANG_FLAGS += -Werror=unknown-warning-option 575KBUILD_CFLAGS += $(CLANG_FLAGS) 576KBUILD_AFLAGS += $(CLANG_FLAGS) 577export CLANG_FLAGS 578endif 579 580# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 581# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 582# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 583# and from include/config/auto.conf.cmd to detect the compiler upgrade. 584CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1) 585 586ifdef config-build 587# =========================================================================== 588# *config targets only - make sure prerequisites are updated, and descend 589# in scripts/kconfig to make the *config target 590 591# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 592# KBUILD_DEFCONFIG may point out an alternative default configuration 593# used for 'make defconfig' 594include arch/$(SRCARCH)/Makefile 595export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 596 597config: outputmakefile scripts_basic FORCE 598 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 599 600%config: outputmakefile scripts_basic FORCE 601 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 602 603else #!config-build 604# =========================================================================== 605# Build targets only - this includes vmlinux, arch specific targets, clean 606# targets and others. In general all targets except *config targets. 607 608# If building an external module we do not care about the all: rule 609# but instead __all depend on modules 610PHONY += all 611ifeq ($(KBUILD_EXTMOD),) 612__all: all 613else 614__all: modules 615endif 616 617# Decide whether to build built-in, modular, or both. 618# Normally, just do built-in. 619 620KBUILD_MODULES := 621KBUILD_BUILTIN := 1 622 623# If we have only "make modules", don't compile built-in objects. 624ifeq ($(MAKECMDGOALS),modules) 625 KBUILD_BUILTIN := 626endif 627 628# If we have "make <whatever> modules", compile modules 629# in addition to whatever we do anyway. 630# Just "make" or "make all" shall build modules as well 631 632ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 633 KBUILD_MODULES := 1 634endif 635 636ifeq ($(MAKECMDGOALS),) 637 KBUILD_MODULES := 1 638endif 639 640export KBUILD_MODULES KBUILD_BUILTIN 641 642ifdef need-config 643include include/config/auto.conf 644endif 645 646ifeq ($(KBUILD_EXTMOD),) 647# Objects we will link into vmlinux / subdirs we need to visit 648core-y := init/ usr/ 649drivers-y := drivers/ sound/ 650drivers-$(CONFIG_SAMPLES) += samples/ 651drivers-y += net/ virt/ 652libs-y := lib/ 653endif # KBUILD_EXTMOD 654 655# The all: target is the default when no target is given on the 656# command line. 657# This allow a user to issue only 'make' to build a kernel including modules 658# Defaults to vmlinux, but the arch makefile usually adds further targets 659all: vmlinux 660 661CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 662 $(call cc-option,-fno-tree-loop-im) \ 663 $(call cc-disable-warning,maybe-uninitialized,) 664export CFLAGS_GCOV 665 666# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 667ifdef CONFIG_FUNCTION_TRACER 668 CC_FLAGS_FTRACE := -pg 669endif 670 671RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 672RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register 673RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 674RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline 675RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 676RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG))) 677export RETPOLINE_CFLAGS 678export RETPOLINE_VDSO_CFLAGS 679 680include arch/$(SRCARCH)/Makefile 681 682ifdef need-config 683ifdef may-sync-config 684# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 685# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 686# because some architectures define CROSS_COMPILE there. 687include include/config/auto.conf.cmd 688 689$(KCONFIG_CONFIG): 690 @echo >&2 '***' 691 @echo >&2 '*** Configuration file "$@" not found!' 692 @echo >&2 '***' 693 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 694 @echo >&2 '*** "make menuconfig" or "make xconfig").' 695 @echo >&2 '***' 696 @/bin/false 697 698# The actual configuration files used during the build are stored in 699# include/generated/ and include/config/. Update them if .config is newer than 700# include/config/auto.conf (which mirrors .config). 701# 702# This exploits the 'multi-target pattern rule' trick. 703# The syncconfig should be executed only once to make all the targets. 704# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 705quiet_cmd_syncconfig = SYNC $@ 706 cmd_syncconfig = $(MAKE) -f $(srctree)/Makefile syncconfig 707 708%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG) 709 +$(call cmd,syncconfig) 710else # !may-sync-config 711# External modules and some install targets need include/generated/autoconf.h 712# and include/config/auto.conf but do not care if they are up-to-date. 713# Use auto.conf to trigger the test 714PHONY += include/config/auto.conf 715 716include/config/auto.conf: 717 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 718 echo >&2; \ 719 echo >&2 " ERROR: Kernel configuration is invalid."; \ 720 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 721 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 722 echo >&2 ; \ 723 /bin/false) 724 725endif # may-sync-config 726endif # need-config 727 728KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 729KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 730KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 731KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 732KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 733 734ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 735KBUILD_CFLAGS += -O2 736else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 737KBUILD_CFLAGS += -O3 738else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 739KBUILD_CFLAGS += -Os 740endif 741 742# Tell gcc to never replace conditional load with a non-conditional one 743KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 744KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 745 746ifdef CONFIG_READABLE_ASM 747# Disable optimizations that make assembler listings hard to read. 748# reorder blocks reorders the control in the function 749# ipa clone creates specialized cloned functions 750# partial inlining inlines only parts of functions 751KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 752 $(call cc-option,-fno-ipa-cp-clone,) \ 753 $(call cc-option,-fno-partial-inlining) 754endif 755 756ifneq ($(CONFIG_FRAME_WARN),0) 757KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 758endif 759 760stackp-flags-y := -fno-stack-protector 761stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 762stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 763 764KBUILD_CFLAGS += $(stackp-flags-y) 765 766ifdef CONFIG_CC_IS_CLANG 767KBUILD_CPPFLAGS += -Qunused-arguments 768KBUILD_CFLAGS += -Wno-format-invalid-specifier 769KBUILD_CFLAGS += -Wno-gnu 770# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 771# source of a reference will be _MergedGlobals and not on of the whitelisted names. 772# See modpost pattern 2 773KBUILD_CFLAGS += -mno-global-merge 774else 775 776# These warnings generated too much noise in a regular build. 777# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 778KBUILD_CFLAGS += -Wno-unused-but-set-variable 779 780# Warn about unmarked fall-throughs in switch statement. 781# Disabled for clang while comment to attribute conversion happens and 782# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed. 783KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,) 784endif 785 786KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 787ifdef CONFIG_FRAME_POINTER 788KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 789else 790# Some targets (ARM with Thumb2, for example), can't be built with frame 791# pointers. For those, we don't have FUNCTION_TRACER automatically 792# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 793# incompatible with -fomit-frame-pointer with current GCC, so we don't use 794# -fomit-frame-pointer with FUNCTION_TRACER. 795ifndef CONFIG_FUNCTION_TRACER 796KBUILD_CFLAGS += -fomit-frame-pointer 797endif 798endif 799 800# Initialize all stack variables with a 0xAA pattern. 801ifdef CONFIG_INIT_STACK_ALL_PATTERN 802KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 803endif 804 805# Initialize all stack variables with a zero value. 806ifdef CONFIG_INIT_STACK_ALL_ZERO 807# Future support for zero initialization is still being debated, see 808# https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being 809# renamed or dropped. 810KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 811KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 812endif 813 814DEBUG_CFLAGS := 815 816# Workaround for GCC versions < 5.0 817# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801 818ifdef CONFIG_CC_IS_GCC 819DEBUG_CFLAGS += $(call cc-ifversion, -lt, 0500, $(call cc-option, -fno-var-tracking-assignments)) 820endif 821 822ifdef CONFIG_DEBUG_INFO 823 824ifdef CONFIG_DEBUG_INFO_SPLIT 825DEBUG_CFLAGS += -gsplit-dwarf 826else 827DEBUG_CFLAGS += -g 828endif 829 830ifneq ($(LLVM_IAS),1) 831KBUILD_AFLAGS += -Wa,-gdwarf-2 832endif 833 834ifdef CONFIG_DEBUG_INFO_DWARF4 835DEBUG_CFLAGS += -gdwarf-4 836endif 837 838ifdef CONFIG_DEBUG_INFO_REDUCED 839DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 840 $(call cc-option,-fno-var-tracking) 841endif 842 843ifdef CONFIG_DEBUG_INFO_COMPRESSED 844DEBUG_CFLAGS += -gz=zlib 845KBUILD_AFLAGS += -gz=zlib 846KBUILD_LDFLAGS += --compress-debug-sections=zlib 847endif 848 849endif # CONFIG_DEBUG_INFO 850 851KBUILD_CFLAGS += $(DEBUG_CFLAGS) 852export DEBUG_CFLAGS 853 854ifdef CONFIG_FUNCTION_TRACER 855ifdef CONFIG_FTRACE_MCOUNT_RECORD 856 # gcc 5 supports generating the mcount tables directly 857 ifeq ($(call cc-option-yn,-mrecord-mcount),y) 858 CC_FLAGS_FTRACE += -mrecord-mcount 859 export CC_USING_RECORD_MCOUNT := 1 860 endif 861 ifdef CONFIG_HAVE_NOP_MCOUNT 862 ifeq ($(call cc-option-yn, -mnop-mcount),y) 863 CC_FLAGS_FTRACE += -mnop-mcount 864 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 865 endif 866 endif 867endif 868ifdef CONFIG_HAVE_FENTRY 869 ifeq ($(call cc-option-yn, -mfentry),y) 870 CC_FLAGS_FTRACE += -mfentry 871 CC_FLAGS_USING += -DCC_USING_FENTRY 872 endif 873endif 874export CC_FLAGS_FTRACE 875KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 876KBUILD_AFLAGS += $(CC_FLAGS_USING) 877ifdef CONFIG_DYNAMIC_FTRACE 878 ifdef CONFIG_HAVE_C_RECORDMCOUNT 879 BUILD_C_RECORDMCOUNT := y 880 export BUILD_C_RECORDMCOUNT 881 endif 882endif 883endif 884 885# We trigger additional mismatches with less inlining 886ifdef CONFIG_DEBUG_SECTION_MISMATCH 887KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 888endif 889 890ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 891KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 892LDFLAGS_vmlinux += --gc-sections 893endif 894 895ifdef CONFIG_SHADOW_CALL_STACK 896CC_FLAGS_SCS := -fsanitize=shadow-call-stack 897KBUILD_CFLAGS += $(CC_FLAGS_SCS) 898export CC_FLAGS_SCS 899endif 900 901ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B 902KBUILD_CFLAGS += -falign-functions=32 903endif 904 905# arch Makefile may override CC so keep this after arch Makefile is included 906NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 907 908# warn about C99 declaration after statement 909KBUILD_CFLAGS += -Wdeclaration-after-statement 910 911# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 912KBUILD_CFLAGS += -Wvla 913 914# disable pointer signed / unsigned warnings in gcc 4.0 915KBUILD_CFLAGS += -Wno-pointer-sign 916 917# disable stringop warnings in gcc 8+ 918KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 919 920# We'll want to enable this eventually, but it's not going away for 5.7 at least 921KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds) 922KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds) 923KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 924 925# Another good warning that we'll want to enable eventually 926KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 927 928# Enabled with W=2, disabled by default as noisy 929KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized) 930 931# disable invalid "can't wrap" optimizations for signed / pointers 932KBUILD_CFLAGS += -fno-strict-overflow 933 934# Make sure -fstack-check isn't enabled (like gentoo apparently did) 935KBUILD_CFLAGS += -fno-stack-check 936 937# conserve stack if available 938KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 939 940# Prohibit date/time macros, which would make the build non-deterministic 941KBUILD_CFLAGS += -Werror=date-time 942 943# enforce correct pointer usage 944KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 945 946# Require designated initializers for all marked structures 947KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 948 949# change __FILE__ to the relative path from the srctree 950KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 951 952# include additional Makefiles when needed 953include-y := scripts/Makefile.extrawarn 954include-$(CONFIG_KASAN) += scripts/Makefile.kasan 955include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 956include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 957include-$(CONFIG_KCOV) += scripts/Makefile.kcov 958include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 959 960include $(addprefix $(srctree)/, $(include-y)) 961 962# scripts/Makefile.gcc-plugins is intentionally included last. 963# Do not add $(call cc-option,...) below this line. When you build the kernel 964# from the clean source tree, the GCC plugins do not exist at this point. 965 966# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 967KBUILD_CPPFLAGS += $(KCPPFLAGS) 968KBUILD_AFLAGS += $(KAFLAGS) 969KBUILD_CFLAGS += $(KCFLAGS) 970 971KBUILD_LDFLAGS_MODULE += --build-id=sha1 972LDFLAGS_vmlinux += --build-id=sha1 973 974ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 975LDFLAGS_vmlinux += $(call ld-option, -X,) 976endif 977 978ifeq ($(CONFIG_RELR),y) 979LDFLAGS_vmlinux += --pack-dyn-relocs=relr 980endif 981 982# We never want expected sections to be placed heuristically by the 983# linker. All sections should be explicitly named in the linker script. 984ifdef CONFIG_LD_ORPHAN_WARN 985LDFLAGS_vmlinux += --orphan-handling=warn 986endif 987 988# Align the bit size of userspace programs with the kernel 989KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 990KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 991 992# make the checker run with the right architecture 993CHECKFLAGS += --arch=$(ARCH) 994 995# insure the checker run with the right endianness 996CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 997 998# the checker needs the correct machine size 999CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1000 1001# Default kernel image to build when no specific target is given. 1002# KBUILD_IMAGE may be overruled on the command line or 1003# set in the environment 1004# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1005# this default value 1006export KBUILD_IMAGE ?= vmlinux 1007 1008# 1009# INSTALL_PATH specifies where to place the updated kernel and system map 1010# images. Default is /boot, but you can set it to other values 1011export INSTALL_PATH ?= /boot 1012 1013# 1014# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1015# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1016# an argument if needed. Otherwise it defaults to the kernel install path 1017# 1018export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1019 1020# 1021# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1022# relocations required by build roots. This is not defined in the 1023# makefile but the argument can be passed to make if needed. 1024# 1025 1026MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1027export MODLIB 1028 1029# 1030# INSTALL_MOD_STRIP, if defined, will cause modules to be 1031# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 1032# the default option --strip-debug will be used. Otherwise, 1033# INSTALL_MOD_STRIP value will be used as the options to the strip command. 1034 1035ifdef INSTALL_MOD_STRIP 1036ifeq ($(INSTALL_MOD_STRIP),1) 1037mod_strip_cmd = $(STRIP) --strip-debug 1038else 1039mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 1040endif # INSTALL_MOD_STRIP=1 1041else 1042mod_strip_cmd = true 1043endif # INSTALL_MOD_STRIP 1044export mod_strip_cmd 1045 1046# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 1047# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 1048# or CONFIG_MODULE_COMPRESS_XZ. 1049 1050mod_compress_cmd = true 1051ifdef CONFIG_MODULE_COMPRESS 1052 ifdef CONFIG_MODULE_COMPRESS_GZIP 1053 mod_compress_cmd = $(KGZIP) -n -f 1054 endif # CONFIG_MODULE_COMPRESS_GZIP 1055 ifdef CONFIG_MODULE_COMPRESS_XZ 1056 mod_compress_cmd = $(XZ) -f 1057 endif # CONFIG_MODULE_COMPRESS_XZ 1058endif # CONFIG_MODULE_COMPRESS 1059export mod_compress_cmd 1060 1061ifdef CONFIG_MODULE_SIG_ALL 1062$(eval $(call config_filename,MODULE_SIG_KEY)) 1063 1064mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 1065else 1066mod_sign_cmd = true 1067endif 1068export mod_sign_cmd 1069 1070HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf) 1071 1072has_libelf = $(call try-run,\ 1073 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0) 1074 1075ifdef CONFIG_STACK_VALIDATION 1076 ifeq ($(has_libelf),1) 1077 objtool_target := tools/objtool FORCE 1078 else 1079 SKIP_STACK_VALIDATION := 1 1080 export SKIP_STACK_VALIDATION 1081 endif 1082endif 1083 1084ifdef CONFIG_BPF 1085ifdef CONFIG_DEBUG_INFO_BTF 1086 ifeq ($(has_libelf),1) 1087 resolve_btfids_target := tools/bpf/resolve_btfids FORCE 1088 else 1089 ERROR_RESOLVE_BTFIDS := 1 1090 endif 1091endif # CONFIG_DEBUG_INFO_BTF 1092endif # CONFIG_BPF 1093 1094PHONY += prepare0 1095 1096export MODORDER := $(extmod-prefix)modules.order 1097export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps 1098 1099ifeq ($(KBUILD_EXTMOD),) 1100core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 1101 1102vmlinux-dirs := $(patsubst %/,%,$(filter %/, \ 1103 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 1104 $(libs-y) $(libs-m))) 1105 1106vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1107 $(patsubst %/,%,$(filter %/, $(core-) \ 1108 $(drivers-) $(libs-)))) 1109 1110subdir-modorder := $(addsuffix modules.order,$(filter %/, \ 1111 $(core-y) $(core-m) $(libs-y) $(libs-m) \ 1112 $(drivers-y) $(drivers-m))) 1113 1114build-dirs := $(vmlinux-dirs) 1115clean-dirs := $(vmlinux-alldirs) 1116 1117# Externally visible symbols (used by link-vmlinux.sh) 1118KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y)) 1119KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y))) 1120ifdef CONFIG_MODULES 1121KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1122KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1123else 1124KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1125endif 1126KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y)) 1127 1128export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1129export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1130# used by scripts/Makefile.package 1131export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1132 1133vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1134 1135# Recurse until adjust_autoksyms.sh is satisfied 1136PHONY += autoksyms_recursive 1137ifdef CONFIG_TRIM_UNUSED_KSYMS 1138# For the kernel to actually contain only the needed exported symbols, 1139# we have to build modules as well to determine what those symbols are. 1140# (this can be evaluated only once include/config/auto.conf has been included) 1141KBUILD_MODULES := 1 1142 1143autoksyms_recursive: descend modules.order 1144 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1145 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1146endif 1147 1148autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1149 1150quiet_cmd_autoksyms_h = GEN $@ 1151 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1152 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1153 1154$(autoksyms_h): 1155 $(call cmd,autoksyms_h) 1156 1157ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1158 1159# Final link of vmlinux with optional arch pass after final link 1160cmd_link-vmlinux = \ 1161 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \ 1162 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1163 1164vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1165 +$(call if_changed,link-vmlinux) 1166 1167targets := vmlinux 1168 1169# The actual objects are generated when descending, 1170# make sure no implicit rule kicks in 1171$(sort $(vmlinux-deps) $(subdir-modorder)): descend ; 1172 1173filechk_kernel.release = \ 1174 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1175 1176# Store (new) KERNELRELEASE string in include/config/kernel.release 1177include/config/kernel.release: FORCE 1178 $(call filechk,kernel.release) 1179 1180# Additional helpers built in scripts/ 1181# Carefully list dependencies so we do not try to build scripts twice 1182# in parallel 1183PHONY += scripts 1184scripts: scripts_basic scripts_dtc 1185 $(Q)$(MAKE) $(build)=$(@) 1186 1187# Things we need to do before we recursively start building the kernel 1188# or the modules are listed in "prepare". 1189# A multi level approach is used. prepareN is processed before prepareN-1. 1190# archprepare is used in arch Makefiles and when processed asm symlink, 1191# version.h and scripts_basic is processed / created. 1192 1193PHONY += prepare archprepare 1194 1195archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1196 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1197 include/generated/autoconf.h 1198 1199prepare0: archprepare 1200 $(Q)$(MAKE) $(build)=scripts/mod 1201 $(Q)$(MAKE) $(build)=. 1202 1203# All the preparing.. 1204prepare: prepare0 prepare-objtool prepare-resolve_btfids 1205 1206# Support for using generic headers in asm-generic 1207asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1208 1209PHONY += asm-generic uapi-asm-generic 1210asm-generic: uapi-asm-generic 1211 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1212 generic=include/asm-generic 1213uapi-asm-generic: 1214 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1215 generic=include/uapi/asm-generic 1216 1217PHONY += prepare-objtool prepare-resolve_btfids 1218prepare-objtool: $(objtool_target) 1219ifeq ($(SKIP_STACK_VALIDATION),1) 1220ifdef CONFIG_UNWINDER_ORC 1221 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1222 @false 1223else 1224 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1225endif 1226endif 1227 1228prepare-resolve_btfids: $(resolve_btfids_target) 1229ifeq ($(ERROR_RESOLVE_BTFIDS),1) 1230 @echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1231 @false 1232endif 1233# Generate some files 1234# --------------------------------------------------------------------------- 1235 1236# KERNELRELEASE can change from a few different places, meaning version.h 1237# needs to be updated, so this check is forced on all builds 1238 1239uts_len := 64 1240define filechk_utsrelease.h 1241 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1242 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1243 exit 1; \ 1244 fi; \ 1245 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1246endef 1247 1248define filechk_version.h 1249 echo \#define LINUX_VERSION_CODE $(shell \ 1250 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1251 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))' 1252endef 1253 1254$(version_h): FORCE 1255 $(call filechk,version.h) 1256 $(Q)rm -f $(old_version_h) 1257 1258include/generated/utsrelease.h: include/config/kernel.release FORCE 1259 $(call filechk,utsrelease.h) 1260 1261PHONY += headerdep 1262headerdep: 1263 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1264 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1265 1266# --------------------------------------------------------------------------- 1267# Kernel headers 1268 1269#Default location for installed headers 1270export INSTALL_HDR_PATH = $(objtree)/usr 1271 1272quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1273 cmd_headers_install = \ 1274 mkdir -p $(INSTALL_HDR_PATH); \ 1275 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1276 usr/include $(INSTALL_HDR_PATH) 1277 1278PHONY += headers_install 1279headers_install: headers 1280 $(call cmd,headers_install) 1281 1282PHONY += archheaders archscripts 1283 1284hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1285 1286PHONY += headers 1287headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1288 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1289 $(error Headers not exportable for the $(SRCARCH) architecture)) 1290 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1291 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1292 1293# Deprecated. It is no-op now. 1294PHONY += headers_check 1295headers_check: 1296 @: 1297 1298ifdef CONFIG_HEADERS_INSTALL 1299prepare: headers 1300endif 1301 1302PHONY += scripts_unifdef 1303scripts_unifdef: scripts_basic 1304 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1305 1306# --------------------------------------------------------------------------- 1307# Kernel selftest 1308 1309PHONY += kselftest 1310kselftest: 1311 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1312 1313kselftest-%: FORCE 1314 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1315 1316PHONY += kselftest-merge 1317kselftest-merge: 1318 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1319 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1320 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1321 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1322 1323# --------------------------------------------------------------------------- 1324# Devicetree files 1325 1326ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1327dtstree := arch/$(SRCARCH)/boot/dts 1328endif 1329 1330ifneq ($(dtstree),) 1331 1332%.dtb: include/config/kernel.release scripts_dtc 1333 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1334 1335PHONY += dtbs dtbs_install dtbs_check 1336dtbs: include/config/kernel.release scripts_dtc 1337 $(Q)$(MAKE) $(build)=$(dtstree) 1338 1339ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1340export CHECK_DTBS=y 1341dtbs: dt_binding_check 1342endif 1343 1344dtbs_check: dtbs 1345 1346dtbs_install: 1347 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1348 1349ifdef CONFIG_OF_EARLY_FLATTREE 1350all: dtbs 1351endif 1352 1353endif 1354 1355PHONY += scripts_dtc 1356scripts_dtc: scripts_basic 1357 $(Q)$(MAKE) $(build)=scripts/dtc 1358 1359ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1360export CHECK_DT_BINDING=y 1361endif 1362 1363PHONY += dt_binding_check 1364dt_binding_check: scripts_dtc 1365 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1366 1367# --------------------------------------------------------------------------- 1368# Modules 1369 1370ifdef CONFIG_MODULES 1371 1372# By default, build modules as well 1373 1374all: modules 1375 1376# When we're building modules with modversions, we need to consider 1377# the built-in objects during the descend as well, in order to 1378# make sure the checksums are up to date before we record them. 1379ifdef CONFIG_MODVERSIONS 1380 KBUILD_BUILTIN := 1 1381endif 1382 1383# Build modules 1384# 1385# A module can be listed more than once in obj-m resulting in 1386# duplicate lines in modules.order files. Those are removed 1387# using awk while concatenating to the final file. 1388 1389PHONY += modules 1390modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare 1391 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1392 1393PHONY += modules_check 1394modules_check: modules.order 1395 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1396 1397cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@ 1398 1399modules.order: $(subdir-modorder) FORCE 1400 $(call if_changed,modules_order) 1401 1402targets += modules.order 1403 1404# Target to prepare building external modules 1405PHONY += modules_prepare 1406modules_prepare: prepare 1407 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1408 1409# Target to install modules 1410PHONY += modules_install 1411modules_install: _modinst_ _modinst_post 1412 1413PHONY += _modinst_ 1414_modinst_: 1415 @rm -rf $(MODLIB)/kernel 1416 @rm -f $(MODLIB)/source 1417 @mkdir -p $(MODLIB)/kernel 1418 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1419 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1420 rm -f $(MODLIB)/build ; \ 1421 ln -s $(CURDIR) $(MODLIB)/build ; \ 1422 fi 1423 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1424 @cp -f modules.builtin $(MODLIB)/ 1425 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1426 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1427 1428# This depmod is only for convenience to give the initial 1429# boot a modules.dep even before / is mounted read-write. However the 1430# boot script depmod is the master version. 1431PHONY += _modinst_post 1432_modinst_post: _modinst_ 1433 $(call cmd,depmod) 1434 1435ifeq ($(CONFIG_MODULE_SIG), y) 1436PHONY += modules_sign 1437modules_sign: 1438 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1439endif 1440 1441else # CONFIG_MODULES 1442 1443# Modules not configured 1444# --------------------------------------------------------------------------- 1445 1446PHONY += modules modules_install 1447modules modules_install: 1448 @echo >&2 1449 @echo >&2 "The present kernel configuration has modules disabled." 1450 @echo >&2 "Type 'make config' and enable loadable module support." 1451 @echo >&2 "Then build a kernel with module support enabled." 1452 @echo >&2 1453 @exit 1 1454 1455endif # CONFIG_MODULES 1456 1457### 1458# Cleaning is done on three levels. 1459# make clean Delete most generated files 1460# Leave enough to build external modules 1461# make mrproper Delete the current configuration, and all generated files 1462# make distclean Remove editor backup files, patch leftover files and the like 1463 1464# Directories & files removed with 'make clean' 1465CLEAN_FILES += include/ksym vmlinux.symvers \ 1466 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1467 compile_commands.json 1468 1469# Directories & files removed with 'make mrproper' 1470MRPROPER_FILES += include/config include/generated \ 1471 arch/$(SRCARCH)/include/generated .tmp_objdiff \ 1472 debian snap tar-install \ 1473 .config .config.old .version \ 1474 Module.symvers \ 1475 signing_key.pem signing_key.priv signing_key.x509 \ 1476 x509.genkey extra_certificates signing_key.x509.keyid \ 1477 signing_key.x509.signer vmlinux-gdb.py \ 1478 *.spec 1479 1480# Directories & files removed with 'make distclean' 1481DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS 1482 1483# clean - Delete most, but leave enough to build external modules 1484# 1485clean: rm-files := $(CLEAN_FILES) 1486 1487PHONY += archclean vmlinuxclean 1488 1489vmlinuxclean: 1490 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1491 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1492 1493clean: archclean vmlinuxclean 1494 1495# mrproper - Delete all generated files, including .config 1496# 1497mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1498mrproper-dirs := $(addprefix _mrproper_,scripts) 1499 1500PHONY += $(mrproper-dirs) mrproper 1501$(mrproper-dirs): 1502 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1503 1504mrproper: clean $(mrproper-dirs) 1505 $(call cmd,rmfiles) 1506 1507# distclean 1508# 1509distclean: rm-files := $(wildcard $(DISTCLEAN_FILES)) 1510 1511PHONY += distclean 1512 1513distclean: mrproper 1514 $(call cmd,rmfiles) 1515 @find $(srctree) $(RCS_FIND_IGNORE) \ 1516 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1517 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1518 -o -name 'core' \) \ 1519 -type f -print | xargs rm -f 1520 1521 1522# Packaging of the kernel to various formats 1523# --------------------------------------------------------------------------- 1524 1525%src-pkg: FORCE 1526 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1527%pkg: include/config/kernel.release FORCE 1528 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1529 1530# Brief documentation of the typical targets used 1531# --------------------------------------------------------------------------- 1532 1533boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1534boards := $(sort $(notdir $(boards))) 1535board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1536board-dirs := $(sort $(notdir $(board-dirs:/=))) 1537 1538PHONY += help 1539help: 1540 @echo 'Cleaning targets:' 1541 @echo ' clean - Remove most generated files but keep the config and' 1542 @echo ' enough build support to build external modules' 1543 @echo ' mrproper - Remove all generated files + config + various backup files' 1544 @echo ' distclean - mrproper + remove editor backup and patch files' 1545 @echo '' 1546 @echo 'Configuration targets:' 1547 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1548 @echo '' 1549 @echo 'Other generic targets:' 1550 @echo ' all - Build all targets marked with [*]' 1551 @echo '* vmlinux - Build the bare kernel' 1552 @echo '* modules - Build all modules' 1553 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1554 @echo ' dir/ - Build all files in dir and below' 1555 @echo ' dir/file.[ois] - Build specified target only' 1556 @echo ' dir/file.ll - Build the LLVM assembly file' 1557 @echo ' (requires compiler support for LLVM assembly generation)' 1558 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1559 @echo ' (requires a recent binutils and recent build (System.map))' 1560 @echo ' dir/file.ko - Build module including final link' 1561 @echo ' modules_prepare - Set up for building external modules' 1562 @echo ' tags/TAGS - Generate tags file for editors' 1563 @echo ' cscope - Generate cscope index' 1564 @echo ' gtags - Generate GNU GLOBAL index' 1565 @echo ' kernelrelease - Output the release version string (use with make -s)' 1566 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1567 @echo ' image_name - Output the image name (use with make -s)' 1568 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1569 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1570 echo '' 1571 @echo 'Static analysers:' 1572 @echo ' checkstack - Generate a list of stack hogs' 1573 @echo ' versioncheck - Sanity check on version.h usage' 1574 @echo ' includecheck - Check for duplicate included header files' 1575 @echo ' export_report - List the usages of all exported symbols' 1576 @echo ' headerdep - Detect inclusion cycles in headers' 1577 @echo ' coccicheck - Check with Coccinelle' 1578 @echo ' clang-analyzer - Check with clang static analyzer' 1579 @echo ' clang-tidy - Check with clang-tidy' 1580 @echo '' 1581 @echo 'Tools:' 1582 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1583 @echo '' 1584 @echo 'Kernel selftest:' 1585 @echo ' kselftest - Build and run kernel selftest' 1586 @echo ' Build, install, and boot kernel before' 1587 @echo ' running kselftest on it' 1588 @echo ' Run as root for full coverage' 1589 @echo ' kselftest-all - Build kernel selftest' 1590 @echo ' kselftest-install - Build and install kernel selftest' 1591 @echo ' kselftest-clean - Remove all generated kselftest files' 1592 @echo ' kselftest-merge - Merge all the config dependencies of' 1593 @echo ' kselftest to existing .config.' 1594 @echo '' 1595 @$(if $(dtstree), \ 1596 echo 'Devicetree:'; \ 1597 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1598 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1599 echo ' dt_binding_check - Validate device tree binding documents'; \ 1600 echo ' dtbs_check - Validate device tree source files';\ 1601 echo '') 1602 1603 @echo 'Userspace tools targets:' 1604 @echo ' use "make tools/help"' 1605 @echo ' or "cd tools; make help"' 1606 @echo '' 1607 @echo 'Kernel packaging:' 1608 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1609 @echo '' 1610 @echo 'Documentation targets:' 1611 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1612 @echo '' 1613 @echo 'Architecture specific targets ($(SRCARCH)):' 1614 @$(if $(archhelp),$(archhelp),\ 1615 echo ' No architecture specific help defined for $(SRCARCH)') 1616 @echo '' 1617 @$(if $(boards), \ 1618 $(foreach b, $(boards), \ 1619 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1620 echo '') 1621 @$(if $(board-dirs), \ 1622 $(foreach b, $(board-dirs), \ 1623 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1624 printf " %-16s - Show all of the above\\n" help-boards; \ 1625 echo '') 1626 1627 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1628 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1629 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1630 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1631 @echo ' (sparse by default)' 1632 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1633 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1634 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1635 @echo ' 1: warnings which may be relevant and do not occur too often' 1636 @echo ' 2: warnings which occur quite often but may still be relevant' 1637 @echo ' 3: more obscure warnings, can most likely be ignored' 1638 @echo ' Multiple levels can be combined with W=12 or W=123' 1639 @echo '' 1640 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1641 @echo 'For further info see the ./README file' 1642 1643 1644help-board-dirs := $(addprefix help-,$(board-dirs)) 1645 1646help-boards: $(help-board-dirs) 1647 1648boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1649 1650$(help-board-dirs): help-%: 1651 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1652 @$(if $(boards-per-dir), \ 1653 $(foreach b, $(boards-per-dir), \ 1654 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1655 echo '') 1656 1657 1658# Documentation targets 1659# --------------------------------------------------------------------------- 1660DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1661 linkcheckdocs dochelp refcheckdocs 1662PHONY += $(DOC_TARGETS) 1663$(DOC_TARGETS): 1664 $(Q)$(MAKE) $(build)=Documentation $@ 1665 1666# Misc 1667# --------------------------------------------------------------------------- 1668 1669PHONY += scripts_gdb 1670scripts_gdb: prepare0 1671 $(Q)$(MAKE) $(build)=scripts/gdb 1672 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1673 1674ifdef CONFIG_GDB_SCRIPTS 1675all: scripts_gdb 1676endif 1677 1678else # KBUILD_EXTMOD 1679 1680### 1681# External module support. 1682# When building external modules the kernel used as basis is considered 1683# read-only, and no consistency checks are made and the make 1684# system is not used on the basis kernel. If updates are required 1685# in the basis kernel ordinary make commands (without M=...) must 1686# be used. 1687# 1688# The following are the only valid targets when building external 1689# modules. 1690# make M=dir clean Delete all automatically generated files 1691# make M=dir modules Make all modules in specified dir 1692# make M=dir Same as 'make M=dir modules' 1693# make M=dir modules_install 1694# Install the modules built in the module directory 1695# Assumes install directory is already created 1696 1697# We are always building only modules. 1698KBUILD_BUILTIN := 1699KBUILD_MODULES := 1 1700 1701build-dirs := $(KBUILD_EXTMOD) 1702PHONY += modules 1703modules: $(MODORDER) 1704 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1705 1706$(MODORDER): descend 1707 @: 1708 1709PHONY += modules_install 1710modules_install: _emodinst_ _emodinst_post 1711 1712install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1713PHONY += _emodinst_ 1714_emodinst_: 1715 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1716 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1717 1718PHONY += _emodinst_post 1719_emodinst_post: _emodinst_ 1720 $(call cmd,depmod) 1721 1722compile_commands.json: $(extmod-prefix)compile_commands.json 1723PHONY += compile_commands.json 1724 1725clean-dirs := $(KBUILD_EXTMOD) 1726clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1727 $(KBUILD_EXTMOD)/compile_commands.json 1728 1729PHONY += help 1730help: 1731 @echo ' Building external modules.' 1732 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1733 @echo '' 1734 @echo ' modules - default target, build the module(s)' 1735 @echo ' modules_install - install the module' 1736 @echo ' clean - remove generated files in module directory only' 1737 @echo '' 1738 1739# no-op for external module builds 1740PHONY += prepare modules_prepare 1741 1742endif # KBUILD_EXTMOD 1743 1744# Single targets 1745# --------------------------------------------------------------------------- 1746# To build individual files in subdirectories, you can do like this: 1747# 1748# make foo/bar/baz.s 1749# 1750# The supported suffixes for single-target are listed in 'single-targets' 1751# 1752# To build only under specific subdirectories, you can do like this: 1753# 1754# make foo/bar/baz/ 1755 1756ifdef single-build 1757 1758# .ko is special because modpost is needed 1759single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1760single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS))) 1761 1762$(single-ko): single_modpost 1763 @: 1764$(single-no-ko): descend 1765 @: 1766 1767ifeq ($(KBUILD_EXTMOD),) 1768# For the single build of in-tree modules, use a temporary file to avoid 1769# the situation of modules_install installing an invalid modules.order. 1770MODORDER := .modules.tmp 1771endif 1772 1773PHONY += single_modpost 1774single_modpost: $(single-no-ko) modules_prepare 1775 $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER) 1776 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1777 1778KBUILD_MODULES := 1 1779 1780export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko)) 1781 1782# trim unrelated directories 1783build-dirs := $(foreach d, $(build-dirs), \ 1784 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) 1785 1786endif 1787 1788ifndef CONFIG_MODULES 1789KBUILD_MODULES := 1790endif 1791 1792# Handle descending into subdirectories listed in $(build-dirs) 1793# Preset locale variables to speed up the build process. Limit locale 1794# tweaks to this spot to avoid wrong language settings when running 1795# make menuconfig etc. 1796# Error messages still appears in the original language 1797PHONY += descend $(build-dirs) 1798descend: $(build-dirs) 1799$(build-dirs): prepare 1800 $(Q)$(MAKE) $(build)=$@ \ 1801 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \ 1802 need-builtin=1 need-modorder=1 1803 1804clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1805PHONY += $(clean-dirs) clean 1806$(clean-dirs): 1807 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1808 1809clean: $(clean-dirs) 1810 $(call cmd,rmfiles) 1811 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1812 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1813 -o -name '*.ko.*' \ 1814 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1815 -o -name '*.dwo' -o -name '*.lst' \ 1816 -o -name '*.su' -o -name '*.mod' \ 1817 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1818 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1819 -o -name '*.asn1.[ch]' \ 1820 -o -name '*.symtypes' -o -name 'modules.order' \ 1821 -o -name '.tmp_*.o.*' \ 1822 -o -name '*.c.[012]*.*' \ 1823 -o -name '*.ll' \ 1824 -o -name '*.gcno' \) -type f -print | xargs rm -f 1825 1826# Generate tags for editors 1827# --------------------------------------------------------------------------- 1828quiet_cmd_tags = GEN $@ 1829 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1830 1831tags TAGS cscope gtags: FORCE 1832 $(call cmd,tags) 1833 1834# Script to generate missing namespace dependencies 1835# --------------------------------------------------------------------------- 1836 1837PHONY += nsdeps 1838nsdeps: export KBUILD_NSDEPS=1 1839nsdeps: modules 1840 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1841 1842# Clang Tooling 1843# --------------------------------------------------------------------------- 1844 1845quiet_cmd_gen_compile_commands = GEN $@ 1846 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 1847 1848$(extmod-prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 1849 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \ 1850 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 1851 $(call if_changed,gen_compile_commands) 1852 1853targets += $(extmod-prefix)compile_commands.json 1854 1855PHONY += clang-tidy clang-analyzer 1856 1857ifdef CONFIG_CC_IS_CLANG 1858quiet_cmd_clang_tools = CHECK $< 1859 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 1860 1861clang-tidy clang-analyzer: $(extmod-prefix)compile_commands.json 1862 $(call cmd,clang_tools) 1863else 1864clang-tidy clang-analyzer: 1865 @echo "$@ requires CC=clang" >&2 1866 @false 1867endif 1868 1869# Scripts to check various things for consistency 1870# --------------------------------------------------------------------------- 1871 1872PHONY += includecheck versioncheck coccicheck export_report 1873 1874includecheck: 1875 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1876 -name '*.[hcS]' -type f -print | sort \ 1877 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1878 1879versioncheck: 1880 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1881 -name '*.[hcS]' -type f -print | sort \ 1882 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1883 1884coccicheck: 1885 $(Q)$(BASH) $(srctree)/scripts/$@ 1886 1887export_report: 1888 $(PERL) $(srctree)/scripts/export_report.pl 1889 1890PHONY += checkstack kernelrelease kernelversion image_name 1891 1892# UML needs a little special treatment here. It wants to use the host 1893# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1894# else wants $(ARCH), including people doing cross-builds, which means 1895# that $(SUBARCH) doesn't work here. 1896ifeq ($(ARCH), um) 1897CHECKSTACK_ARCH := $(SUBARCH) 1898else 1899CHECKSTACK_ARCH := $(ARCH) 1900endif 1901checkstack: 1902 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1903 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1904 1905kernelrelease: 1906 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1907 1908kernelversion: 1909 @echo $(KERNELVERSION) 1910 1911image_name: 1912 @echo $(KBUILD_IMAGE) 1913 1914# Clear a bunch of variables before executing the submake 1915 1916ifeq ($(quiet),silent_) 1917tools_silent=s 1918endif 1919 1920tools/: FORCE 1921 $(Q)mkdir -p $(objtree)/tools 1922 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1923 1924tools/%: FORCE 1925 $(Q)mkdir -p $(objtree)/tools 1926 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1927 1928quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1929 cmd_rmfiles = rm -rf $(rm-files) 1930 1931# Run depmod only if we have System.map and depmod is executable 1932quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1933 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1934 $(KERNELRELEASE) 1935 1936# read saved command lines for existing targets 1937existing-targets := $(wildcard $(sort $(targets))) 1938 1939-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1940 1941endif # config-build 1942endif # mixed-build 1943endif # need-sub-make 1944 1945PHONY += FORCE 1946FORCE: 1947 1948# Declare the contents of the PHONY variable as phony. We keep that 1949# information in a variable so we can use it in if_changed and friends. 1950.PHONY: $(PHONY) 1951